Like Caitlin, I'd been lulled into a false sense of security. When Julian completed the surgery and the two made up, it seemed like the danger had passed.

But the hints were there. Cisco teasing her about being frosty. Caitlin saying she'd rather die than use her meta healing. The close-up of the Killer Frost headline on the board.

I have been wondering when and how the transformation would happen. But the fact that I didn't see it coming made the final scene that much more powerful.

Obviously, Caitlin wasn't going to die. As soon as she crashed, I connected the dots. Even so, my heart sped up with nerves as Julian, Cisco, and H.R. scrambled to save her.

I was so focused on not hurting you as Killer Frost that I forgot I could hurt you as Caitlin Snow. And for that, I'm very sorry. So I understand if you don't trust me anymore, but maybe you can find it in your heart to forgive me.

He made the call to save her life, but in doing so, he ignored her wishes. That kind of betrayal of trust might not be forgivable under normal circumstances.

Let alone when Caitlin's now being ruled by her dark side.

This also means the future remains on track. Killer Frost being loose ties into Iris ending up dead at Savitar's hands.

Unless Barry's plan to speed into the future reveals the answers he needs.

Did everyone cringe when he announced his intentions? On The Flash Season 3 Episode 17, Barry told Kara in the middle of a song that he's not supposed to run into the past anymore.

But the future is okay? I want to be mad about this because it falls into the 'Barry's learned nothing' category. Except it's so deeply woven into the fabric of the show at this point that I would be more shocked if Barry stopped messing with time.

Iris: He's a murderer. Barry: I know he's a murderer. But how many murderers have we put in prison? How many bad guys have we taken down? Don't we deserve one win? After everything that we've done?Iris: Life doesn't keep score, Barry.

Follow The Flash

Iris: He's a murderer. Barry: I know he's a murderer. But how many murderers have we put in prison? How many bad guys have we taken down? Don't we deserve one win? After everything that we've done?Iris: Life doesn't keep score, Barry.